[PATCH 1/2] block: export task_work_add()

The loop driver wants to synchronously perform autoclear operation, for
some userspace programs (e.g. xfstest) depend on that the autoclear
operation already completes by the moment lo_release() from close()
returns to userspace and immediately call umount() of a partition
containing a backing file which the autoclear operation will close().

Export task_work_add() so that the loop driver can perform autoclear
operation by the moment lo_release() from close() returns to userspace.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
---
 kernel/task_work.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/task_work.c b/kernel/task_work.c
index 1698fbe6f0e1..2a1644189182 100644
--- a/kernel/task_work.c
+++ b/kernel/task_work.c

@@ -60,6 +60,7 @@ int task_work_add(struct task_struct *task, struct callback_head *work,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(task_work_add);
 
 /**
  * task_work_cancel_match - cancel a pending work added by task_work_add()

-- 
2.32.0